Remove tsutil.decapitate

[jeromekelleher]

Closes #2269

Waiting on #2240

Stacked on #2331

[codecov]

Codecov Report

Merging #2283 (94a0354) into main (6cde9a6) will decrease coverage by 0.01%.
The diff coverage is 93.37%.

❗ Current head 94a0354 differs from pull request most recent head 9482f5f. Consider uploading reports for the commit 9482f5f to get more accurate results

@@            Coverage Diff             @@
##             main    #2283      +/-   ##
==========================================
- Coverage   93.28%   93.26%   -0.02%     
==========================================
  Files          28       28              
  Lines       26382    26642     +260     
  Branches     1188     1213      +25     
==========================================
+ Hits        24610    24848     +238     
- Misses       1742     1762      +20     
- Partials       30       32       +2     

Flag	Coverage Δ
c-tests	92.25% <86.72%> (-0.06%)	⬇️
lwt-tests	89.05% <ø> (ø)
python-c-tests	71.35% <35.17%> (-0.32%)	⬇️
python-tests	98.87% <99.37%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
c/tskit/core.h	100.00% <ø> (ø)
c/tskit/tables.c	90.24% <84.69%> (-0.09%)	⬇️
python/_tskitmodule.c	90.66% <88.37%> (+<0.01%)	⬆️
python/tskit/drawing.py	99.17% <98.66%> (-0.26%)	⬇️
c/tskit/core.c	97.91% <100.00%> (+0.01%)	⬆️
c/tskit/trees.c	95.08% <100.00%> (+<0.01%)	⬆️
python/tskit/genotypes.py	98.46% <100.00%> (+0.46%)	⬆️
python/tskit/tables.py	98.89% <100.00%> (+<0.01%)	⬆️
python/tskit/trees.py	98.18% <100.00%> (+0.03%)	⬆️
python/tskit/vcf.py	100.00% <100.00%> (ø)
... and 2 more

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[benjeffery]

LGTM!